For those looking at the Goliath V2 or the Steam Crave RDTA, I own both and I highly recommend either. Here's my findings:
Steam Crave
The SC is in essence a tank fed dripper. As a dripper, it doesn't always like being laid on it's side. It's not the kind of device you can throw in a bag, or leave laying on your car passenger seat. I would say it's ideal for the kind of situation where you can keep it upright most of the time. Don't get me wrong, you can close off the airflow and put it in your pocket etc, but just be wary of the above.
Flavour
Flavour wise, it is outstanding. Steam Crave's main ethos with anything they design is flavour. Don't get me wrong, the cloud chasers out there will be happy, but don't expect Velocity style fog in your house. The new 2 post deck is as you can imagine a dream to build on, you can do various builds on it, I've even seen a quad build! The vape band/airflow control works very well, yes it is a bit of a strange method for those used to more discreet rings, but it does exactly what it's supposed to and very well. You soon get used to it.
Airflow
Airflow is great. With all 4 holes open, you really can get a great lung hit, slightly restricted, but not uncomfortably so. Don't expect Mutation X v4 wide open!
Capacity
I have the 3ml version as I like the height of it, but I like that you can also buy a new top and glass and have the option to have a 6ml version. Steam Crave are very good with design and options. The design of the RDTA is brilliant and one I'm sure is already being copied.
Filling
You fill the tank from the bottom and it's great. There are loads of holes in it, so no worries of air pockets. I've comfortably filled with a glass pipette.
Stock coils
Steam Crave have just released coils for the RDTA, which is a great addition to their arsenal. I haven't used them, so cannot comment on how they perform.
Goliath V2
I love the design of this. The juice control is
fantastic. A quick quarter turn of the ring and it's on, or off, or somewhere in-between depending on the viscosity of your juice.
Quality
Build quality is great as you would expect from UD. When broken apart, there is a knack to putting it back together because of the way the juice flow works, but I like that.
Filling
You can either fill from the bottom by unscrewing the tank, or, with the right technique, unofficially from the top. I prefer from the top as it can be tricky filling it from the bottom with thicker juices.
Building
As it's a 2 post deck, building on it is great. I really don't like 3 or 4 post decks now. The screws are some of the best I've used. It would take a lot to clip the leads. I've used 28 gauge NI200 in it without a problem. It is quite a small deck, so don't try and put a 3mm clapton in there! I find 2.5mm is about the limit.
Flavour
Flavour on it is fantastic. I previously had the Billow V2 and this is far superior. Much better than the Zephyrus too IMO.
Airflow
The airflow holes are massive, so you get great airflow off it. It is possible to get a mouth to lung hit on it, but I would say it's more for lung inhales.
Stock coils
The other great thing is you can buy stock coils for it if you don't build, or you fancy a rest. I have tried the 0.5 coils and they were great. Funky taste for about half a tank, but after that they were great.
There's my 2 cents/pence for those interested!